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        r1.innerHTML = `2 阶梯子，兔子有 ${climbStairs(2)} 种跳法到达月球。`;
        r2.innerHTML = `3 阶梯子，兔子有 ${climbStairs(3)} 种跳法到达月球。`;
        r3.innerHTML = `4 阶梯子，兔子有 ${climbStairs(4)} 种跳法到达月球。`;
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